And there lies part of the problem. Anything that Go did is almost totally beyond the pale even if it was universally popular with passengers (never let it be suggested that Go ever did anything better than EJ...Ha!) and such a move will stick severely in the EJ craw for that reason, plus having to go against the institutional Holy Cow of "not invented here" which is another EJ management obsession.
It will only happen if it makes more money than it costs to implement, is guaranteed not to adversely affect on time performance and the managers responsible will trouser sufficient £x00,000 bonuses to soothe their conciences (!) over breaking the two shibboleths in the first para.